Traffic signal



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Patented Apr. 2, i929.

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WILLIAM L. MAGHUGH, 0F PHILADELPHIA, PENNSYLVANIA.

ADJUSTMENT FOR INDUCTANCES 0F VABIOMETERS.

Application filed July 28,

Mv invention relates to variometers and particularly to improiuament in wave length control for diilerent settings ot the variom eter. j

The main purpose of my invention is to provide a novel form of yariometer well adapted to the needs of service and easy and inexpensive to manufacture. I

A further purpose is to balance the coils ot the rotor quantitatively *ith respect to the coils of the stator maintaining equal sellinductions in both whatever the adjustn'lent with respect to the quantity of induction.

A further purpose is to have every coil of the rotor and every coil. of the stator balanced electrically with respect to every other coil of the variometer by dividingeach co l so as to always lie substantially symmetrically with respect to the same point in the rotor axis a point forming a common center of symmetryfor all windings.

A further purpose is to provide an 1nterlinkage of: switch members whereby the num-. ber of coils in the rotor and stator. separately adjustable if desired may be adjustable together in such n'ianner as to ma etain a predetermined relation between the numbers of coils simultaneously in circuit on the rotor and on the stator: or in other words that the number oi turns in the rotor and the stator respectively may be increased or reduced together to maintain a conditiono't numerical balance or numerical relation between them.

A further purpose is to make it possible to accommodate a variometer to lower ranges of wave length than previously without losing its utility for higher wave lengths.

A further purpose is to increase the deli-- cacy of adjustment of the variometer.

My invention relates to the processes involved as well as to apparatus shown by which the processes may be carried out.

Further purposes will appear in the specification and in the claims.

Figure 1 is a front elevation of a desirable panel providing adjustment of my preferred construction.

Figure 2 is a section of Figure 1 upon line 22, the winding being omitted.

Figure 3 is a section on line 33 of Figure 2. I

Figure 4 is a diagrammatic illustration of the preferred form of my invention.

Figure 5. is a diagrammatic illustration 1924. Serial No. 728,568.

showing the winding whereby my invention may be carried outusing any switch preferably the one shown in Figures 1 and 4.

Figure 5 is a fragmentary view, a part of Figure 5 but with a minor modification.

F igure 6 is a front elevation showing another form of switch, providing if desired, an independent adjustment of the coils of the stator and of the rotor.

F igure 7 is a front elevation of a third form of switch, also providing an optional independent adjustment of the rotor andstator coils.

Figure 8 is a section of Figure 7 taken upon the line 88.

Variometers for the purpose of adjusting inductances in radio circuits are of course well known. The rotor is ordinarily given rotation adjustmentthroughout a range of 180 between the positions for maximum and minimum inductanees respectively.

in the position for maximum inductance the rotor coils are in such position that the mutual inductance between the rotor and stator is most effective toward increasing the total inductance of the variometer, while at the other end of the ran '0 the mutual induc tance is in position to be most effective to decrease total inductance.

In the prior art variometers have been set to different ranges of inductance for variation by the position of the rotor by adjusting theturns of one element to include a larger or smaller number of turns within the active coil. length, but so far I am aware this adjustment in. the number of effective turns has never been simultaneous to both stator and rotor.

My invention comprises provision for simultaneous adjustment of the ellective turns on both statorand rotor, with an adaption to alternative independent adjustment of the effective turns of each; provision for maintaining electrical balance between each coil unit of the variometer with every other coil of the variometer; and provision for maintaining throughout the simultaneous adjustment equal inductions in the rotor and stator whereby the rotor and stator are adapted to most nearly neutralize each other when indirect opposition thereby bringing the lower limits for the different settings most nearly to zero.

The alternative independent adjustments Patented Apr. 2, 1929.

' marten UNITED STATES ADOLF B. SCHLEICHER, 0F PASADENA, CALIFORNIA, ASSIGNOR TO THE STANDARD TRAFFIC MARKER COMPANY, OF WICHITA, KANSAS, A COREORATJlION OF KANSAS.

' TRAFFIC SIGNAL.

Application filed August as, 1925. Serial m. 53,393.

My invention relates to the handling ofvehicle traffic by the display of suitable signs and markings indicating warnings to traflic of safety zones, street crossings, boulevard and other stops. It is particularly desirable to display warning signs directly in the path of vehicle traffic and preferable to have such signs above the surface of the street or road so that the attention of drivers will be arrested a sutlicient distance from the sign to permit appropriate control of-the vehicle in due time to observe the warning displayed on the si n. Various forms of warning signs have een designed for-this purpose but as far as I am informed, all of such signs have been of a rigid or semi-rigid construction and unsuitable to being placed directly in the path of trafic, as collision with such signs results either in injury to the vehicle or to the sign.

The principal object of my invention con sists in providing a warning sign of the class 1.described, of'elastic or semi-elastic material "hich may-be placed directly in the path of traffic and not afford any appreciable obstruction thereto.

Another object of my invention is to provide a warnin sign of the class described which is provi ed with a base member permanentl secured in the street or roadway, such sign aving an elastic portion projecting upwardly therefrom above the surface of the street or roadway.

Other objects and advantages will apear hereinafter from the following description.

Referring to the drawings which are for illustrative purposes only and in which I show a preferred form of my invention:

Fig. 1 is a diagrammatic perspective View of a street intersection showing in general an application of warning signs embodying my invention to such an intersection.

Fig. 2 is an enlarged perspective View of one of the warning signs shown in Fig. 1, and

Fig. 3 is a vertical sectional view of the sign shown in Fig. 2, showing the manner of mounting such sign in the street or roadway.

The sign preferably consists of a base member indicated at 11, made of hard rubber or other suitable material, the edges of which are beveled outwardly as shown at 12, so that the material of the street or roadway extends over such edge as indicated at 13, thereby firmly holding such base member in place.

The base member 11 is preferably set into the street orroadway with the upper face thereof flush with the surface of the street or roadway as shown in Fig. 3.

Extending upwardly from the base 11 is the display portion of the sign consisting in the form shown of a substantially flat member or panel 14, the lower portion of which alon its sides, is provided with corrugations or ribs 15. This corrugated or ribbed portion of the member 14 extends into the base 11 as shown in Fig. 3, being cemented or otherwise secured therein.

The panel or member 14 is preferably made of soft rubber having high elastic quality so that in the event the wheels of vehicles strike the sign the panel is flexed or bent over, thereby permitting the wheel to pass over the sign without any damage or injury to the sign or vehicle and without forming any appreciable obstruction to such passage of the wheels thereover. The dotted lines 16 in Fig. 3 indicate an intermediate position of the panel during the bending movement of the same,

caused as for instance by a vehicle wheel as 1;

When so placed it is obvious that while ordinarily the signs may be avoided, at the same time the signs may be repeatedly run over without destroying the efficiency of the signers a warning member. At 21 in Fig. 1, l ave diagrammatically shown astreet car landing zone indicated by a base member 22 which outlines one side and two ends of such zone. On the end nearest approaching tratiic 1s placed a panel or upright elastic member 23 having a proper warning display thereon as may be deemed necessary to Warn traffic of the location of such zone. While I have shown and described in particular two forms or uses of my warning sign it will be understood that I do not limit my invention to such forms but include any form of such device in which a base or attaching member tacts and which has two diameters 88 and 89. The pivot passes through a preferably insulated sleeve 90 and is held in position by nut 91.

The double contact 92 corresponding to contact of the other form is movable about the pivot at the point of larger diameter 88 and is insulated from it by sleeve 93 and by disc 94.

The contact arms and 86 are both moved by handle 95 and the double contact 92 is moved by a handle 96. So far as thus describedthese two contact arms, the double contact 85, 86 and the double contact 92 are wholly distinct and separate and may be moved separately to form any of the combinations of which the number of fixed contact plugs and joining coils for the stator and rotor is capable. In order to permit them to be coupled together for common movement I provide a screw pin 96 upon one of the arms which engages within an opening in an insulated lug 97 upon or in the other. ll hen this screw and lug are engaged the contact arms operate in the same way as the contact arms of the form shown in the other figures.

It will be obvious that my invention is independent of the character of the winding, whether bank or otherwise.

Its adaptation to maintain during inductance adj ustinent equal inductances in rotor and stator widens the ranges of the rotor.

Its :ulaptation to independent adjustment of the inductances ot the rotor and stator permits close adjustment to any desired maximum, and permits variation of the rotor ranges without any substantial variation in the total selt inductances of the stator. and rotor. i 1

And finally, the symmetry of every coil with respect to the variometer axis and there fore with respect to every other coil, among other advantages provides electric balance for all settin gs. In view of my invention and disclosure variations and modifications to meet individual whim or particular need will doubtless become evident to others skilled in the art and I claim all. such in so far as they fall within the reasonable spirit and scope of my invention.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is 1. In a variometer, a stator inductance and a rotor inductance and connected means for simultaneously adjusting both inductances, the stator and rotor being relatively rotatable independently of the adjustment.

In a variometer, substantially equal stator and rotor inductancos and connected means for simultaneously adjusting both inductances with maintenance of substantial equality between the adjustments.

In a varioineter, stator and rotor inductances, an adjustment for the stator inductance, a separate adjustment "for the rotor inductance, and means for coupling the adjustments to operate together.

a. In a variometer, a rotor winding divided into sections, a stator Winding divided into sections, contacts with which the divisions of the sections are electrically connected and common means for connecting with the respective contacts to secure equality of winding in the rotor and stator respectively independently of rotation of the rotor and for a variety of different total windings.

5. In a variometer, a rotor and stator in series with each other and each having its coil divided into sections, a series of contacts connected with the rotor sections, a series of contacts connected with the stator sections, in dependently movable switchv arms, one engaging each series of contac to include more or iewer coils in the circuit in each, and means for connecting the switch arms to move in unison.

G. In a variometer, a rotor coil divided into sections, a 1 lurality oil? switch contacts to which the section terminals are connected, arranged to are shaped, a stator winding divided into sections, a plurality of switch contacts towhich the stator section terminals are connected, arranged about the same center as the are of the rotor contacts, switch fingers bearing upon the respective contacts and insulated from each other, common rotor means for the switch fingers and contacts made by said switch lingers at the opposite ends thereof from the first contacts.

\VILLIAM L. MAGHUGI 

